<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header class="home-header">
            <div>
                <img src="../assets/heima.png">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside width="200px" class="home-aside">
                <el-menu background-color="#333744" text-color="#fff" active-text-color="#409eff" unique-opened :router="true" :default-active="activePath">
                        <!-- 一级菜单 -->
                    <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                        <template slot="title">
                            <!-- 小图片 -->
                            <i :class="iconfObj[item.id]"></i>
                            <span>{{item.authName}}</span>
                        </template>
                        <!-- 二级菜单 -->
                        <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                            <template slot="title">
                            <i class="el-icon-menu" ></i>
                            <span>{{subItem.authName}}</span>
                        </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 右侧主体内容 -->
            <el-main class="home-main">
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data(){
        return{
            //左侧菜单数据
            menuList:[],
            iconfObj:{
                '125':'iconfont icon-users',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpingouwudai2',
                '102':'iconfont icon-danju-tianchong',
                '145':'iconfont icon-baobiao'
            },
            //被激活的链接地址
            activePath:''
        }
    },
    //定义生命周期函数，使页面加载时立即获取菜单
    created(){
        this.getMenuList()
        this.activePath=window.sessionStorage.getItem('activePath')
    },
    methods:{
        logout(){
            window.sessionStorage.clear();
            this.$router.push("/login")
        },
        //获取所有的菜单
        async getMenuList(){
            const {data:res}=await this.$http.get('menus')
            if(res.meta.status!==200) return this.$message.error(res.meta.msg)
            this.menuList=res.data
        },
        //保存链接的激活状态
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath)
            this.activePath=activePath
        }
    }
}
</script>

<style lang="less" scoped>
.home-container{
    height: 100%;
}
.home-header{
    display: flex;
    //左右贴边对齐
    justify-content: space-between;
    //按钮居中
    align-items: center;
    color: #fff;
    font-size: 20px;
    background-color: #373d41;
    >div{
        display: flex;
        align-items: center;
        span{
            margin-left: 20px;
        }
    }

}
.home-aside{
    background-color: #333744;
    .el-menu{
        border: none;
    }
}
.home-main{
    background-color: #eaedf1;
}
.iconfont{
    margin-right: 10px;
}
</style>